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CAT24C208WI-GT3 Folha de dados(PDF) 5 Page - Catalyst Semiconductor

Nome de Peças CAT24C208WI-GT3
Descrição Electrónicos  8-Kb Dual Port Serial EEPROM
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Fabricante Electrônico  CATALYST [Catalyst Semiconductor]
Página de início  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

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CAT24C208
5
Doc No. 1044, Rev. F
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
FUNCTIONAL DESCRIPTION
The CAT24C208 has a total memory space of 1K bytes
which is accessible from either of two I2C interface
ports, (DSP_SDA and DSP_SCL) or (DDC_SDA and
DDC_SCL), and with the use of segment pointer at
address 60h. On power up and after any instruction, the
segment pointer will be in segment 00h for DSP and in
segment 00h of the bank selected by the configuration
register for DDC.
The entire memory appears as contiguous memory
space from the perspective of the display interface
(DSP_SDA and DSP_SCL), see Table 2, and Figures
11 to Figure 18 for a complete description of the DSP
Interface.
A configuration register at addresses 62/63h is used to
configure the operation and memory map of the device
as seen from the DDC interface, (DDC_SDA and
DDC_SCL).
Read and write operations can be performed on any
location within the memory space from the display DSP
interface regardless of the state of the EDID SEL pin or
the activity on the DDC interface.
From the DDC
interface, the memory space appears as two 512 byte
banks of memory, with 2 segments each 00h and 01h in
the upper and lower bank, see Table 1.
Each bank of memory can be used to store an E-EDID
data structure. However, only one bank can be read
through the DDC port at a time. The active bank of
memory (that is, the bank that appears at address A0h
on the DDC port) is controlled through the configuration
register at 62/63h and the EDID_SEL pin.
No write operations are possible from the DDC interface
unless the DDC Write Enable bit is set (WE = 1) in the
device configuration register at device address 62h.
The device automatically arbitrates between the two
interfaces to allow the appearance of individual access
to the memory from each interface.
In a typical E-EDID application the EDID_SEL pin is
usually connected to the “Analog Cable Detect” pin of a
VESA M1 compliant, dual-mode (analog and digital)
display. In this manner, the E-EDID appearing at ad-
dress A0h on the DDC port will be either the analog or
digital E-EDID, depending on the state of the “Analog
Cable Detect” pin (pin C3 of the M1-DA connector). See
Figure 1.
Figure 1.
TO HOST
CONTROLLER
28
27
8
HPD
FUSE, RESISTOR
OR OTHER CURRENT
LIMITING DEVICE
REQUIRED IN ALL M1 DISPLAYS
2A MAX
RELAY CONTACTS SHOWN IN
DE-ENERGIZED POSITION
E-EDID
EEPROM
8
7
6
5
DDC +5V
DDC CLK
DDC DATA
26
C3
47.5K
10K
1
2
3
4
I2C TO PROJECTOR/MONITOR
DISPLAY CONTROLLER
+5V DC
(SUPPLIED
BY DISPLAY)
Segment 1
256 Bytes
Segment 0
256 Bytes
Segment 1
256 Bytes
Segment 0
256 Bytes
Segment 3
256 Bytes
Segment 2
256 Bytes
Segment 1
256 Bytes
Segment 0
256 Bytes
01
00
01
00
11
10
01
00
00
00
00
Segment Pointer
No Segment Pointer
Segment Pointer
No Segment Pointer
Lower
Bank
Upper
Bank
Address by
Configuration Register
(see Figure 19)
MEMORY ARRAY
MEMORY ARRAY
Table 1: DDC Interface
Table 2: DSP Interface


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